JP2002155243A - Method for forming bright film and coated material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for forming a bright film by which the bright film having interference actions and capable of exhibiting a glaring bright feeling with a three-dimensional feeling without causing filter clogging can be formed and to obtain a coated material. SOLUTION: This method for forming the bright film comprises successively carrying out the following steps (1) to (3). (1) a step of forming a bright base film on a substrate, (2) a step of forming at least one layer of a clear film containing a bright pigment containing a metal oxide-coated glass flake pigment having 20-40 μm D50 and <=60 μm D90 and (3) a step of forming a clear top film.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a glittering coating film which gives a strong glittering feeling and a three-dimensional glittering feeling, and a coated article.

[0002]

2. Description of the Related Art Conventionally, metallic paints containing aluminum powder or mica powder have been used as glitter paints for forming metallic coating films having metallic luster. Among them, as a method of forming a glittering coating film exhibiting a three-dimensional glittering feeling by multi-directional reflection, for example, Japanese Patent Application Laid-Open No.
No. 64 discloses (1) a step of forming a brilliant-containing base coating film on a substrate, and (2) (A) an average particle diameter (D ₅₀ ).
Is 20 ± 5 μm, the average particle thickness is 0.5 to 1.5 μm,
An aluminum flake pigment having a gradient n of 2.5 or more in a rosin-Rammler diagram or a synthetic mica powder pigment coated with (B) a metal oxide is provided with at least one brilliant material based on 100 parts by mass of resin solid content. It has been proposed to sequentially perform a step of forming at least one layer of a clear coating film containing a glittering material containing 0.05 to less than 0.1 part by mass.

However, the glitter pigment used in the glitter clear coating film used in the above prior art is a specific aluminum flake pigment and / or synthetic mica powder pigment, and the glitter of the obtained coating film is an aluminum flake pigment. And the interference effect of the synthetic mica powder pigment or the combined effect thereof, and the glittering feeling of the glittering brightness is not sufficient.

JP-A-2-160079 discloses a first metallic coating film containing aluminum powder formed on the surface of an object to be coated and a metallic glitter layer formed on the surface of the first metallic coating film. A metallic coating comprising a second metallic coating containing flaky glass powder and a clear coating formed on the surface of the second metallic coating has been proposed. However, since the flaky glass powder having a metallic glitter layer used here is a flaky glass powder having a metal plating layer, there is a drawback that an interference effect and a three-dimensional glitter are not obtained.

On the other hand, in a glitter paint containing a glass flake pigment, the glass flake pigment itself is liable to be clogged in a filter installed for removing dust and lumps in a circulation pipe during circulation. There is a problem that.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a brilliant coating film having an interference effect, capable of exhibiting a three-dimensional and brilliant brightness, and not causing clogging of a filter. An object of the present invention is to provide a forming method and a coated object.

[0007]

Means for Solving the Problems The present inventors have conducted intensive studies in view of the above-mentioned problems, and as a result, have reached the present invention. 1. A glittering coating film forming method in which the following steps (1) to (3) for forming a coating film are sequentially performed. (1) a step of forming a glittering base coating film on a substrate, (2)
D ₅₀ is 20~40μm and the step of at least one layer forming a effect pigment-containing clear coating film containing a metal oxide-coated glass flake pigment D ₉₀ of at 60μm or less,
(3) Step of forming clear top coating film The content of the metal oxide-coated glass flake pigment in the bright pigment-containing clear coating film is 0.01 to 10% by mass.
The above method for forming a glittering coating film. 3. The above method for forming a glittering coating film, wherein the content of the metal oxide-coated glass flake pigment in the glittering pigment-containing clear coating film is 0.05 to 3% by mass. 4. The glass flake pigment has a D ₅₀ of 20 to 35 μm,
The above-mentioned method for forming a glittering coating film, wherein D ₉₀ is 30 to 50 μm. 5. The above glittering coating film forming method, wherein the clear top coating film is formed by a paint containing a carboxyl group-containing polymer and an epoxy group-containing polymer. 6. A coated article coated by the above glittering coating film forming method.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of the present invention will be described below in detail.

[0009] glistening coating forming method of the present invention includes forming a glittering base coating film (1) substrate, (2) D ₅₀ is 2
A step of forming at least one layer of a bright pigment-containing clear coating containing a metal oxide-coated glass flake pigment having 0 to 40 μm and a D ₉₀ of 60 μm or less, (3) forming a clear top coating sequentially It is.

In the method for forming a glittering coating film of the present invention, first, as a first step, a glittering base coating film is formed on a substrate.
Examples of the base material include, but are not limited to, metals such as iron, aluminum, copper, and alloys thereof; inorganic materials such as glass, cement, and concrete; polyethylene resins, polypropylene resins, and ethylene-vinyl acetate copolymers. Resin, polyamide resin, acrylic resin, vinylidene chloride resin, polycarbonate resin, polyurethane resin, epoxy resin and other plastics and various FRP plastic materials; natural and synthetic materials such as wood and fiber materials (paper, cloth, etc.) Is mentioned.

In the method for forming a glittering coating film of the present invention,
The glitter base coating film is formed on the base material directly or through a base coating film. If the glitter coating film forming method of the present invention is applied to a base material of an automobile body and parts, a chemical conversion treatment is performed in advance. It is preferable to apply an undercoating such as an electrodeposition coating and, if necessary, an intermediate coating. The intermediate coating is performed for hiding the base, imparting chipping resistance, and ensuring adhesion with the top coat. In the present specification, the base material subjected to the above-described treatment and painting is also included.

A glitter base coating film is used for forming the glitter base coating film on the substrate. In the case where the base material has been subjected to a base coat with an undercoat, an intermediate coat or the like, a wet-on-wet (W / W) method or a wet-on-dry (W / D) method is applied on the obtained base coat. The glittering paint can be applied by the method. W above
The / W method is a method in which a base coat is applied, then dried by air drying or the like, and applied to an uncured or semi-cured base coat. In contrast, the W / D method is baked and cured. This is a method of coating the applied undercoat film.

The method for forming the glittering base coating film on the substrate is not particularly limited, but a spraying method, a roll coater method and the like are preferable, and the coating can be performed a plurality of times. The dry film thickness of the glitter base coating film coated with the glitter coating composition is preferably 5 to 50 μm, more preferably 10 to 30 μm per coat.

The glitter base paint contains a vehicle and a glitter pigment. The vehicle is one in which the glitter pigment and the coloring pigment used as required are dispersed, and is composed of a resin for forming a coating film and, if necessary, a crosslinking agent.

The resin for forming a coating film constituting the vehicle includes, for example, (a) an acrylic resin, (b) a polyester resin, (c) an alkyd resin, (d) a fluororesin,
(E) epoxy resin, (f) polyurethane resin, (g)
A polyether resin is mentioned, and in particular, an acrylic resin and a polyester resin are preferably used from the viewpoint of weather resistance. These can be used in combination of two or more. In addition, the resin for forming a coating film includes a curable type and a lacquer type, and usually, a curable type is used. In the case of a type having curability, it is used by being mixed with a cross-linking agent such as an amino resin or a (block) polyisocyanate compound, an amine-based, a polyamide-based, or a polyvalent carboxylic acid. Let it proceed. It is also possible to use a non-curable type coating film forming resin and a curable type together.

As the acrylic resin (a), there can be mentioned a copolymer of an acrylic monomer and another ethylenically unsaturated monomer. Acrylic monomers that can be used in the above copolymerization include acrylic acid or methacrylic acid methyl, ethyl, propyl, n-butyl, i-butyl, t-butyl, 2-ethylhexyl, lauryl, phenyl, benzyl, 2-hydroxy Esterified compounds such as ethyl and 2-hydroxypropyl, ring-opened adducts of caprolactone of acrylic acid or 2-hydroxyethyl methacrylate, glycidyl acrylate, glycidyl methacrylate, acrylamide, methacrylamide and N-
Methylol acrylamide, polyhydric alcohol (meth)
There are acrylic esters and the like. Other ethylenically unsaturated monomers copolymerizable therewith include styrene, α-methylstyrene, itaconic acid, maleic acid, vinyl acetate and the like.

Examples of the polyester resin (b) include saturated polyester resins and unsaturated polyester resins. Examples thereof include condensates obtained by heat-condensing a polybasic acid and a polyhydric alcohol. Examples of the polybasic acid include saturated polybasic acids and unsaturated polybasic acids.Examples of the saturated polybasic acids include phthalic anhydride, terephthalic acid, and succinic acid. Examples include maleic acid, maleic anhydride, and fumaric acid. Examples of polyhydric alcohols include dihydric alcohols and trihydric alcohols.Examples of dihydric alcohols include ethylene glycol and diethylene glycol, and examples of trihydric alcohols include glycerin,
Trimethylolpropane.

The alkyd resin (c) includes, in addition to the polybasic acids and polyhydric alcohols, fats and oils and fatty acids (soybean oil, linseed oil, coconut oil, stearic acid, etc.), natural resins (rosin, amber, etc.) and the like. An alkyd resin obtained by reacting the above-mentioned denaturing agent can be used.

The (d) fluororesin may be vinylidene fluoride resin or ethylene tetrafluoride resin or a mixture thereof, a fluoroolefin and a hydroxy-containing polymerizable compound, and other copolymerizable vinyl resins. Examples include resins made of various fluorine-based copolymers obtained by copolymerizing monomers made of compounds.

Examples of the epoxy resin (e) include resins obtained by the reaction of bisphenol and epichlorohydrin. Examples of the bisphenol include bisphenols A and F. Examples of the bisphenol type epoxy resin include, for example, Epicoat 828, Epicoat 1001, Epicoat 100
4, Epicoat 1007, Epicoat 1009 (all manufactured by Shell Chemical Co., Ltd.), and those obtained by chain-extending these with an appropriate chain extender can also be used.

Examples of the polyurethane resin (f) include resins having urethane bonds obtained by various polyol components such as acryl, polyester, polyether, and polycarbonate and a polyisocyanate compound. Examples of the polyisocyanate compound include 2,4-tolylene diisocyanate (2,4-TD
I), 2,6-tolylene diisocyanate (2,6-T
DI), and mixtures thereof (TDI), diphenylmethane-4,4′-diisocyanate (4,4′-MD
I), diphenylmethane-2,4'-diisocyanate (2,4'-MDI), and mixtures thereof (MDI)
Naphthalene-1,5-diisocyanate (NDI),
3,3'-dimethyl-4,4'-biphenylene diisocyanate, xylylene diisocyanate (XDI), dicyclohexylmethane diisocyanate (hydrogenated HD
I), isophorone diisocyanate (IPDI), hexamethylene diisocyanate (HDI), hydrogenated xylylene diisocyanate (HXDI) and the like.

The above (g) polyether resin is a polymer or copolymer having an ether bond, such as polyoxyethylene polyether, polyoxypropylene polyether, polyoxybutylene polyether, or bisphenol. A polyether resin having at least two hydroxyl groups per molecule, such as a polyether derived from an aromatic polyhydroxy compound such as A or bisphenol F, can be mentioned. Further, the polyether resin and succinic acid, adipic acid, sebacic acid, phthalic acid, isophthalic acid, terephthalic acid, polyvalent carboxylic acids such as trimellitic acid, or a reactive derivative of these acid anhydrides and the like. Carboxyl group-containing polyether resin obtained by the above method.

When the vehicle contains a cross-linking agent, the ratio of the resin for forming a film to the cross-linking agent is 90 to 50% by mass and the content of the cross-linking agent is 10 to 50% by mass in terms of solid content. Yes, preferably 85 to 60% by mass of the resin for forming the coating film and 15 to 40% by mass of the crosslinking agent. If the amount of the crosslinking agent is less than 10% by mass (the amount of the resin for forming a coating film exceeds 90% by mass), the crosslinking in the coating film may not be sufficient. On the other hand, if the cross-linking agent exceeds 50% by mass (the resin for forming a coating film is less than 50% by mass), the storage stability of the coating composition is reduced and the curing speed is increased. There is.

The glittering pigment contained in the glittering base paint may include those conventionally used for paints. As such, for example, aluminum flake pigment, colored aluminum flake pigment, interference mica pigment, colored mica pigment, metal oxide coated alumina flake pigment, metal oxide coated glass flake, metal plated glass flake, metal oxide coated silica Examples include flake pigments, metal titanium flakes, graphite, stainless flakes, plate-like iron oxide, phthalocyanine flakes, and hologram pigments.

If necessary, the coloring pigments contained in the glittering base paint may be those conventionally used for paints. Examples of such organic pigments include azo lake pigments, phthalocyanine pigments, indico pigments, berylen pigments, quinophthalone pigments, dioxazine pigments, quinacridone pigments, isoindolinone pigments, and metal complex pigments. And inorganic pigments such as, for example, graphite, yellow iron oxide, red iron oxide, titanium dioxide, and carbon black. The addition amount of the glitter pigment and the coloring pigment can be arbitrarily set according to the desired hue. Also, various extender pigments and the like can be used in combination.

When the above-mentioned brilliant pigment and, if necessary, a coloring pigment are used, the total content (P
WC) is preferably less than 50%, more preferably less than 30%. If it exceeds 50%, the appearance of the coating film deteriorates.

In addition to the above-mentioned components, the glittering base coating material includes a polyamide wax as a lubricant dispersion of an aliphatic amide, a polyethylene wax as a colloidal dispersion mainly composed of polyethylene oxide, a curing catalyst, an ultraviolet absorber,
Antioxidants, leveling agents, surface conditioners such as silicon and organic polymers, anti-sagging agents, thickeners, defoamers, lubricants, crosslinkable polymer particles (microgels), and the like can be appropriately added. The performance of paints and coatings can be improved by blending these additives at a ratio of 15 parts by mass or less based on 100 parts by mass of the vehicle (based on solid content).

The above-mentioned brilliant base paint is usually provided in a form in which the above-mentioned constituents are dissolved or dispersed in a solvent. Any solvent may be used as long as it dissolves or disperses the vehicle, and an organic solvent and / or water may be used. Examples of the organic solvent include those commonly used in the field of coatings. Examples thereof include hydrocarbons such as toluene and xylene, ketones such as acetone and methyl ethyl ketone, esters such as ethyl acetate, butyl acetate, cellosolve acetate and butyl cellosolve, and alcohols. When the use of an organic solvent is regulated from the viewpoint of the environment, it is preferable to use water. In this case, an appropriate amount of a hydrophilic organic solvent may be contained.

[0029] In the glistening coating forming method of the present invention, then as a second step, the thus formed was the glittering base coating film, D ₅₀ is 20~50μm and,, D ₉₀
At least one clear coating film containing a bright pigment containing a metal oxide-coated glass flake pigment having a particle size of 60 μm or less.

The content of the metal oxide-coated glass flake pigment in the bright pigment-containing clear coating film (paint solids 1
Mass ratio of solid content of pigment to 00 parts by mass: PWC)
Is preferably 0.01 to 30% by mass. 0.
If the amount is less than 01% by mass, it may be difficult to sufficiently exhibit the particle sensation and the three-dimensional brightness of the glass flake particles, and if it exceeds 30 parts by mass, the appearance of the coating film may be insufficient. Particularly, the content of the metal oxide-coated glass flake pigment in the coating film is 0.05 to 10% by mass.
In the case of the above, the metal oxide-coated glass flake pigment in the coating film is more preferable because the effect scattered in the coating film can be obtained. The glossy pigment-containing clear coating film has a dry film thickness of 20 to 50 per coat.
μm is preferable, and 25 to 40 μm is more preferable.

The formation of the effect pigment-containing clear coating film, D ₅₀ is 20 to 40 [mu] m, and the effect pigment-containing, clear coating containing the metal oxide-coated glass flake pigment D ₉₀ of at 60μm or less using The bright pigment-containing clear coating film is formed by applying this coating material by a well-known method such as a spray method or a roll coater method. The bright pigment-containing clear coating contains a metal oxide-coated glass flake pigment having a specific particle size and a vehicle. The vehicle, additives and solvent contained in the bright pigment-containing clear paint can be the same as those used in the bright base paint.

The above-mentioned metal oxide-coated glass flake pigment is a brilliant pigment in which the surface of a glass flake is coated with a metal oxide such as titanium oxide or iron oxide. Is given.

The above metal oxide-coated glass flake pigment
Is D in a state where the metal oxide is coated.₅₀Is 20-4
0 μm, preferably 20 to 35 μm. The present invention
D in ₅₀Is the relative cumulative particle in the long diameter particle size distribution.
The particle diameter when the cumulative amount in the diameter distribution curve is 50%
To taste. D₅₀Is less than 20 μm, an interference color effect is exhibited.
It is difficult to give a brilliant feeling, and if it exceeds 40 μm,
Poor coating appearance.

The metal oxide-coated glass flake pigment has a D ₉₀ of 60 μm or less, preferably 30 to 50 μm.
μm. Note that D ₉₀ in the present invention is such that the cumulative amount in the relative cumulative particle size distribution curve is 9 in the long particle size distribution.
It means the particle size at 0%. When the D ₉₀ is more than 60μm, cause filter plugging at the time of circulation. The filter referred to here is a Knoe filter having a filter size of about 200 μm.

Further, the thickness of the metal oxide-coated glass flake pigment is preferably from 0.1 to 10 μm, more preferably from 0.1 to 10 μm.
5 μm is more preferred. If the thickness is less than 0.1 μm,
During paint circulation, it takes an excessive share,
The above-mentioned metal oxide-coated glass flake pigment is deformed or broken, causing a discoloration of the paint over time.
If it exceeds 300, the coating film appearance may be deteriorated. The interference color developed by the metal oxide-coated glass flake pigment can be changed by adjusting the amount of the metal oxide to be coated (coating thickness). Films formed using this on a glittering base coating film have an interference effect from both the highlight and shade positions, exhibit a high saturation, and exhibit a design that exhibits strong shine due to glass flake particles. At the same time, when the coating film is further moved, the glass flake particles exhibit a three-dimensional effect of interlocking with the brightness, so that a new impression can be expressed.

The bright pigment-containing clear coating is
As long as the effect of the metal oxide-coated glass flake pigment is not impaired, the glitter pigment described in the above glitter base paint can be used in combination.

In the glittering coating film forming method of the present invention, as a third step, at least one clear top coating film is formed on the glittering pigment-containing clear coating film thus formed. The dry film thickness of the clear top coating film is preferably 20 to 50 μm per coat,
-40 μm is more preferred.

For the formation of the clear top coating film, a clear top paint is used. When the glitter pigment-containing clear coating film contains a large amount of glitter pigment, specifically, when the content of the metal oxide-coated glass flake pigment in the coating film exceeds 1% by mass, the clear top paint When two or more layers are coated, the glitter on the surface can be improved.

As the clear top paint used in the glittering coating film forming method of the present invention, those which are generally used for overcoating can be used. For example, acrylic resin, polyester resin, fluorine resin, epoxy resin, A mixture of at least one thermosetting resin selected from a polyurethane resin, a polyether resin, and a modified resin thereof and the above-described crosslinking agent can be used, and is described in JP-B-8-19315. When a clear coating containing a carboxyl group-containing polymer and an epoxy group-containing polymer increases the difference in solubility with the lower coating layer by acid rain resistance and W / W method, the lower coating It is preferably used from the viewpoint of not disturbing the orientation of the bright pigment in the layer. In addition, these clear coatings may include additives such as coloring pigments, extenders, modifiers, ultraviolet absorbers, leveling agents, dispersants, and defoaming agents as long as the transparency is not impaired. It is possible to mix.

The method for forming the clear top coating film on the substrate is not particularly limited, but a spray method, a roll coater method and the like are preferable. Although the formation of the clear top coating film of the present invention is performed on the bright pigment-containing clear coating film, the formation is performed even after the bright pigment-containing clear coating film is cured, but before the curing. May be. Before curing, the bright pigment-containing clear coating film and the clear top coating film are simultaneously cured. Also,
When the clear top coating film is applied a plurality of times, the clear top coating film may be baked simultaneously after the final clear top coating film is applied, or may be baked for each layer. The clear top coating film formed as described above is baked at 120 to 160 ° C. for a predetermined time to obtain a coating film.

The coated article of the present invention, which has been painted by the glistening coating forming method, on a substrate, glittering base coating film, D ₅₀ is 20 to 40 [mu] m, and, D ₉₀ is, 60
A bright clear coating film and a clear top coating film containing a metal oxide-coated glass flake pigment having a size of not more than μm are formed in this order.

[0042]

EXAMPLES Next, the present invention will be described more specifically with reference to examples and comparative examples, but the present invention is not limited to these examples. In addition, the compounding amount represents a mass part unless there is particular notice.

Examples 1 to 8 and Comparative Examples 1 to 2 Preparation of base material A dull steel plate (length 300 mm, width 100 mm and thickness 0.8 mm) was treated with a zinc phosphate treating agent ("Surfdyne SD2
000 "(manufactured by Nippon Paint Co., Ltd.), and then a cationic electrodeposition paint (" Power Top U-50 ", manufactured by Nippon Paint Co., Ltd.) was electrodeposited so as to have a dry film thickness of 25 [mu] m. Then, after baking at 160 ° C. for 30 minutes, an intermediate coating (“Olga S-90 Sealer Gray”,
(Nippon Paint Co., Ltd.) was applied by air spray coating so as to have a dry film thickness of 40 μm, and baked at 140 ° C. for 30 minutes to form an intermediate coating film, which was used as a substrate.

Preparation of glittering base paint Acrylic resin (styrene / methyl methacrylate / ethyl methacrylate / hydroxyethyl methacrylate /
Methacrylic acid copolymer, number average molecular weight about 20,000,
A hydroxyl value of 45, an acid value of 15, and a solid content of 50% by mass) and a melamine resin ("Uban 20SE", manufactured by Mitsui Chemicals, Inc., solid content of 60% by mass) are blended at a solid content mass ratio of 80:20 to obtain. The following types of pigments were blended in the following amounts (PWC) with the vehicle. Then, an organic solvent (toluene / xylene / ethyl acetate / butyl acetate mass ratio = 70 /
15/10/5) with a stirrer so as to obtain an appropriate coating viscosity to prepare a glittering coating composition. Paint A: Aluminum flake pigment ("Alpaste M
H-8801 ”(manufactured by Asahi Kasei Kogyo Co., Ltd.) in 10% by PWC Paint B: Paint A and carbon black pigment
Paint with 1% added in C

[0045] The same acrylic resin-melamine resin as that used for the preparation the glittering base paint glittering clear coating as a vehicle, D ₅₀ and D ₉₀ of shown in Table 1, the gold color, titanium-coated glass dioxide The flake pigment was blended in the amounts shown in Table 1. Next, the mixture was stirred and mixed with an organic solvent (mass ratio of toluene / xylene / ethyl acetate / butyl acetate = 70/15/10/5) so as to obtain an appropriate coating viscosity by a stirrer to prepare a bright clear coating composition.

On the surface to be coated of the glitter coating film, the glitter base paint obtained above was applied so that the dry film thickness became 15 μm. Coating is an electrostatic coating machine ("Auto REA", manufactured by ABB Industries)
And at an atomization pressure of 2.8 kg / cm ² . After painting 3
After setting for 30 minutes, a glitter clear paint was applied so that the dry film thickness became 35 μm, set at room temperature for 10 minutes, and baked at 140 ° C. for 30 minutes. Next, a clear top paint was applied so as to have a dry film thickness of 35 μm, set at room temperature for 10 minutes, and baked at a temperature of 140 ° C. for 30 minutes. In Examples 2, 3, 5, 7 and Comparative Example 2, a clear top paint was further applied to a dry film thickness of 35 μm, set at room temperature for 10 minutes, and baked at 140 ° C. for 30 minutes. The clear top paint used was an acrylic / melamine resin clear paint 1 ("Super Lac O-130 Clear", manufactured by Nippon Paint Co., Ltd.) or a clear paint 2 containing a carboxyl group-containing polymer and an epoxy group-containing polymer ("" Mac Flow O-520 Clear ", manufactured by Nippon Paint Co., Ltd.). The design of the obtained coating film and the filter clogging property during the formation of the coating film were evaluated by the following evaluation methods. Table 1 shows the results.

Evaluation method : Design: Visual observation of the interference effect from the highlight and shade positions of the test plate, saturation, and strong shine, and the degree of three-dimensional effect with which glass flake particles are linked when the coating film is moved. Was evaluated. 3: The above-mentioned design was clearly expressed. 2 .: The above-mentioned design was almost expressed. 1: The above-mentioned design was not expressed. Filter clogging property: Regarding the bright clear paint,
The degree of clogging of the filter after a continuous circulation test for 7 days was visually evaluated using a Knoe filter having a mesh of 200 μm. 3: No clogging is observed 2: Clogging is slightly observed 1: Clogging is noticeably observed

[0048]

[Table 1]

As is clear from the results shown in Table 1, in Examples 1 to 8 where the glittering coating film was formed by the glittering film forming method of the present invention, interference occurred from both the highlight and shade positions. It has a function, high saturation, and a design that exhibits strong shine due to glass flake particles, and can also exhibit a sense of brightness due to the three-dimensional effect that the glass flake particles work together when moving the coating film. there were. Further, since the glass flakes did not cause clogging of the filter, the coating workability was good. On the other hand, in Comparative Examples 1 and 2, the coating workability was not good because the intended design was not exhibited or the glass flakes clogged the filter.

[0050]

According to the method for forming a glittering coating film of the present invention, a glittering pigment-containing clear coating film containing a metal oxide-coated glass flake pigment having a specific particle size is formed on a glittering base coating film. In addition, since a clear top coating film is formed thereon, it has an interference effect from the positions of highlights and shades, has a high saturation, and exhibits a design exhibiting strong shine of glass flake particles. It is possible to obtain a brilliant coating film exhibiting a sense of brightness by a three-dimensional effect in which the glass flake particles are linked when the film is moved.

Since the coating film obtained by the present invention exhibits the above-mentioned design, it is preferably used in fields such as automobiles and two-wheeled vehicles which require glitter, such as vehicle outer plates, outer surfaces of containers, coil coating, and the home appliance industry.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09C 3/06 C09C 3/06 C09D 5/00 C09D 5/00 Z 7/12 7/12

Claims (6)

[Claims] 1. A method for forming a brilliant coating film, comprising sequentially performing the following coating film forming steps (1) to (3). (1) a step of forming a glittering base coating film on a substrate, (2)
D ₅₀ is 20~40μm and the step of at least one layer forming a effect pigment-containing clear coating film containing a metal oxide-coated glass flake pigment D ₉₀ of at 60μm or less,
(3) Step of forming clear top coating film 2. The content of the metal oxide-coated glass flake pigment in the bright pigment-containing clear coating film is 0.01 to 3%.
The method for forming a glittering coating film according to claim 1, wherein the amount is 0% by mass. 3. The content of the metal oxide-coated glass flake pigment in the bright pigment-containing clear coating film is 0.05 to 1%.
3. The method for forming a glittering coating film according to claim 1, wherein the amount is 0% by mass. 4. The glass flake pigment having a D ₅₀ of 20 to 3
5 [mu] m, and claims 1 to 3 any one glistening coating forming method according D ₉₀ of a 30 to 50 [mu] m. 5. The method according to claim 1, wherein the clear top coating film is formed by a coating material containing a carboxyl group-containing polymer and an epoxy group-containing polymer. 6. A coated article coated by the glittering coating film forming method according to any one of claims 1 to 5.